Supplemental Disclosures of Cash Flows Information (Tables)

3 Months Ended

Mar. 31, 2013

Supplemental Cash Flow Elements [Abstract]

Schedule of supplemental disclosures of cash flows information and non-cash financing and investing activities

	March 31, 2013		March 31, 2012
Stock-based compensation accrual impact, net	$	8,037	$	(12,872)
Cash paid for interest	82,607		65,998